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Home Machine Learning

Machine learning model finds SARS-CoV-2 growing more infectious | MSUToday

June 27, 2020
in Machine Learning
Machine learning model finds SARS-CoV-2 growing more infectious | MSUToday
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A novel machine learning model developed by researchers at Michigan State University suggests that mutations to the SARS-CoV-2 genome have made the virus more infectious. As infections continue to surge across the United States, the concern is that any slight mutation could have drastic consequences. 

The model, developed by lead research Guo-Wei Wei, professor in the Department of Biochemistry and Molecular Biology, analyzed SARS-CoV-2 genotyping from more than 20,000 viral genome samples. The researchers analyzed mutations to the spike protein — a protein primarily responsible for facilitating infection — and found that five of the six known virus subtypes are now more infectious.

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As with any virus, many mutations are ultimately benign, posing little to no risk to infected patients. Some mutations even reduce infectiousness. But some mutations lead to a deadlier, more infectious virus.

Wei and his team have studied and analyzed mutation patterns and locations for months, tracking changes against the official viral genome sample captured in January.

“Knowledge about the infectivity of SARS-CoV-2 is a vital factor for preventive measurements against COVID-19 and reopening the global economy,” Wei said. “A crucial question is what are the ramifications of these mutations to COVID-19 transmission, diagnostics, prevention and treatment.” 

Viral infection occurs when the spike protein interacts with a human host cell receptor called angiotensin-converting enzyme 2 — ACE2 for short. As it relates to ACE2, scientists are concerned about a concept known as binding affinity, or the strength of the binding interaction between the spike protein and host receptor during the initial stage of infection.

“Viral infectivity increases if the binding affinity strengthens,” Wei said. “Currently, more than 50 mutations have been found along with the binding interface on the spike proteins receptor-binding domain — RBD for short — which has 194 possible mutation sites.”

Wei’s machine learning model, a advanced neural network, analyzed more than 8,000 protein interaction records to determine the impact of the current known mutations on the binding affinity of the SARS-CoV-2 spike protein. The result, which showed increased binding affinity in five of the six known subtypes, indicated that infectivity had increased as a result of the mutations.

Concerned about the potential for further mutation, Wei and his team turned their model to the future.

“It’s extremely important to know whether future SARS-CoV-2 subtypes would pose an imminent danger to public health,” Wei said. “To this end, we have conducted a systematic screening of all possible 3,686 future mutations on 194 possible mutation sites along the RBD.”

While Wei cautions that more research is needed and is vital to the public health response to COVID-19, the model predicts that multiple residues on the receptor-binding motif — a component area of the RBD — have high chances to mutate into significantly more infectious COVID-19 strains.

As part of their research, Wei and team also discovered that the novel coronavirus spreading around the world is slightly more infectious than the original SARS virus discovered in 2003.

Wei said the results align with those of another study recently published by researchers at the Scripps Research Institute in Florida. This study examined spike protein mutations in a laboratory setting, also finding that the virus is mutating in ways that increase its infectiousness. 

The paper, Mutations strengthened SARS-CoV-2 infectivity, along with much of the published research concerning COVID-19 and the SARS-CoV-2 virus, appears on the preprint server ArXiv.

(Note for media: Please include a link to the original paper in online coverage: https://arxiv.org/pdf/2005.14669.pdf)

Credit: Google News

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